/*
* Returns 0 on success, negative UST or system error value on error.
*/
int ustctl_recv_register_channel(int sock,
int *session_objd, /* session descriptor (output) */
int *channel_objd, /* channel descriptor (output) */
size_t *nr_fields,
struct ustctl_field **fields)
{
ssize_t len;
struct ustcomm_notify_channel_msg msg;
size_t fields_len;
struct ustctl_field *a_fields;
len = ustcomm_recv_unix_sock(sock, &msg, sizeof(msg));
if (len > 0 && len != sizeof(msg))
return -EIO;
if (len == 0)
return -EPIPE;
if (len < 0)
return len;
*session_objd = msg.session_objd;
*channel_objd = msg.channel_objd;
fields_len = msg.ctx_fields_len;
if (fields_len % sizeof(*a_fields) != 0) {
return -EINVAL;
}
/* recv fields */
if (fields_len) {
a_fields = zmalloc(fields_len);
if (!a_fields) {
len = -ENOMEM;
goto alloc_error;
}
len = ustcomm_recv_unix_sock(sock, a_fields, fields_len);
if (len > 0 && len != fields_len) {
len = -EIO;
goto fields_error;
}
if (len == 0) {
len = -EPIPE;
goto fields_error;
}
if (len < 0) {
goto fields_error;
}
*fields = a_fields;
} else {
*fields = NULL;
}
*nr_fields = fields_len / sizeof(*a_fields);
return 0;
fields_error:
free(a_fields);
alloc_error:
return len;
}
int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
struct lttng_ust_field_iter *iter)
{
struct ustcomm_ust_msg lum;
struct ustcomm_ust_reply lur;
int ret;
ssize_t len;
if (!iter)
return -EINVAL;
memset(&lum, 0, sizeof(lum));
lum.handle = tp_field_list_handle;
lum.cmd = LTTNG_UST_TRACEPOINT_FIELD_LIST_GET;
ret = ustcomm_send_app_cmd(sock, &lum, &lur);
if (ret)
return ret;
len = ustcomm_recv_unix_sock(sock, iter, sizeof(*iter));
if (len != sizeof(*iter)) {
return -EINVAL;
}
DBG("received tracepoint field list entry event_name %s event_loglevel %d field_name %s field_type %d",
iter->event_name,
iter->loglevel,
iter->field_name,
iter->type);
return 0;
}
int ustctl_recv_notify(int sock, enum ustctl_notify_cmd *notify_cmd)
{
struct ustcomm_notify_hdr header;
ssize_t len;
len = ustcomm_recv_unix_sock(sock, &header, sizeof(header));
if (len > 0 && len != sizeof(header))
return -EIO;
if (len == 0)
return -EPIPE;
if (len < 0)
return len;
switch (header.notify_cmd) {
case 0:
*notify_cmd = USTCTL_NOTIFY_CMD_EVENT;
break;
case 1:
*notify_cmd = USTCTL_NOTIFY_CMD_CHANNEL;
break;
default:
return -EINVAL;
}
return 0;
}
int main(int argc, char **argv)
{
const char *home_dir;
char home_rundir[PATH_MAX];
char *cmd = NULL;
int ret, wait_shm_fd;
struct sigaction act;
mode_t old_umask = 0;
long page_size;
set_ulimit();
/* Ignore sigpipe */
memset(&act, 0, sizeof(act));
ret = sigemptyset(&act.sa_mask);
if (ret == -1) {
perror("sigemptyset");
return -1;
}
act.sa_handler = SIG_IGN;
ret = sigaction(SIGPIPE, &act, NULL);
if (ret == -1) {
perror("sigaction");
return -1;
}
/* Handle SIGTERM */
act.sa_handler = handle_signals;
ret = sigaction(SIGTERM, &act, NULL);
if (ret == -1) {
perror("sigaction");
return -1;
}
/* Handle SIGINT */
ret = sigaction(SIGINT, &act, NULL);
if (ret == -1) {
perror("sigaction");
return -1;
}
page_size = sysconf(_SC_PAGE_SIZE);
if (page_size <= 0) {
if (!page_size) {
errno = EINVAL;
}
perror("Error in sysconf(_SC_PAGE_SIZE)");
return -1;
}
if (geteuid() == 0) {
ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
if (ret && errno != EEXIST) {
perror("mkdir");
return -1;
}
wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH,
page_size, 1);
if (wait_shm_fd < 0) {
perror("global wait shm error");
return -1;
}
strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK);
old_umask = umask(0);
} else {
home_dir = (const char *) getenv("HOME");
if (!home_dir) {
perror("getenv error");
return -ENOENT;
}
snprintf(home_rundir, PATH_MAX,
LTTNG_HOME_RUNDIR, home_dir);
ret = mkdir(home_rundir, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
if (ret && errno != EEXIST) {
perror("mkdir");
return -1;
}
snprintf(local_apps_wait_shm_path, PATH_MAX,
DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid());
wait_shm_fd = get_wait_shm(local_apps_wait_shm_path,
page_size, 0);
if (wait_shm_fd < 0) {
perror("local wait shm error");
return -1;
}
snprintf(apps_sock_path, PATH_MAX,
DEFAULT_HOME_APPS_UNIX_SOCK, home_dir);
}
ret = ustcomm_create_unix_sock(apps_sock_path);
if (ret < 0) {
perror("create error");
return ret;
}
apps_socket = ret;
if (getuid() == 0) {
/* File permission MUST be 666 */
ret = chmod(apps_sock_path,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (ret < 0) {
printf("Set file permissions failed: %s\n", apps_sock_path);
perror("chmod");
goto end;
}
umask(old_umask);
}
ret = ustcomm_listen_unix_sock(apps_socket);
if (ret < 0) {
perror("listen error");
return ret;
}
/* wake up futexes */
ret = update_futex(wait_shm_fd, 1);
if (ret) {
fprintf(stderr, "Error wakeup futex\n");
return -1;
}
for (;;) {
int sock;
ssize_t len;
struct {
uint32_t major;
uint32_t minor;
pid_t pid;
pid_t ppid;
uid_t uid;
gid_t gid;
uint32_t bits_per_long;
char name[16]; /* Process name */
} reg_msg;
char bufname[17];
if (quit_program)
break;
printf("Accepting application registration\n");
sock = ustcomm_accept_unix_sock(apps_socket);
if (sock < 0) {
perror("accept error");
goto end;
}
/*
* Basic recv here to handle the very simple data
* that the libust send to register (reg_msg).
*/
len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg));
if (len < 0 || len != sizeof(reg_msg)) {
perror("ustcomm_recv_unix_sock");
continue;
}
memcpy(bufname, reg_msg.name, 16);
bufname[16] = '\0';
printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n",
bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid,
reg_msg.gid, reg_msg.major, reg_msg.minor);
ret = send_app_msgs(sock);
if (ret) {
printf("Error in send_app_msgs.\n");
sleep(1);
}
close(sock);
}
end:
printf("quitting.\n");
/* Let applications know we are not responding anymore */
ret = update_futex(wait_shm_fd, 0);
if (ret) {
fprintf(stderr, "Error wakeup futex\n");
return -1;
}
if (geteuid()) {
printf("Removing %s directory\n", home_rundir);
ret = asprintf(&cmd, "rm -rf %s", home_rundir);
if (ret < 0) {
printf("asprintf failed. Something is really wrong!\n");
return -1;
}
/* Remove lttng run directory */
ret = system(cmd);
if (ret < 0) {
printf("Unable to clean %s\n", home_rundir);
return -1;
}
}
return 0;
}
int ustctl_recv_stream_from_consumer(int sock,
struct lttng_ust_object_data **_stream_data)
{
struct lttng_ust_object_data *stream_data;
ssize_t len;
int ret;
int fds[2];
stream_data = zmalloc(sizeof(*stream_data));
if (!stream_data) {
ret = -ENOMEM;
goto error_alloc;
}
stream_data->type = LTTNG_UST_OBJECT_TYPE_STREAM;
stream_data->handle = -1;
/* recv mmap size */
len = ustcomm_recv_unix_sock(sock, &stream_data->size,
sizeof(stream_data->size));
if (len != sizeof(stream_data->size)) {
if (len < 0)
ret = len;
else
ret = -EINVAL;
goto error;
}
if (stream_data->size == -1) {
ret = -LTTNG_UST_ERR_NOENT;
goto error;
}
/* recv stream nr */
len = ustcomm_recv_unix_sock(sock, &stream_data->u.stream.stream_nr,
sizeof(stream_data->u.stream.stream_nr));
if (len != sizeof(stream_data->u.stream.stream_nr)) {
if (len < 0)
ret = len;
else
ret = -EINVAL;
goto error;
}
/* recv shm fd and wakeup fd */
len = ustcomm_recv_fds_unix_sock(sock, fds, 2);
if (len <= 0) {
if (len < 0) {
ret = len;
goto error;
} else {
ret = -EIO;
goto error;
}
}
stream_data->u.stream.shm_fd = fds[0];
stream_data->u.stream.wakeup_fd = fds[1];
*_stream_data = stream_data;
return 0;
error:
free(stream_data);
error_alloc:
return ret;
}
int ustctl_recv_channel_from_consumer(int sock,
struct lttng_ust_object_data **_channel_data)
{
struct lttng_ust_object_data *channel_data;
ssize_t len;
int wakeup_fd;
int ret;
channel_data = zmalloc(sizeof(*channel_data));
if (!channel_data) {
ret = -ENOMEM;
goto error_alloc;
}
channel_data->type = LTTNG_UST_OBJECT_TYPE_CHANNEL;
channel_data->handle = -1;
/* recv mmap size */
len = ustcomm_recv_unix_sock(sock, &channel_data->size,
sizeof(channel_data->size));
if (len != sizeof(channel_data->size)) {
if (len < 0)
ret = len;
else
ret = -EINVAL;
goto error;
}
/* recv channel type */
len = ustcomm_recv_unix_sock(sock, &channel_data->u.channel.type,
sizeof(channel_data->u.channel.type));
if (len != sizeof(channel_data->u.channel.type)) {
if (len < 0)
ret = len;
else
ret = -EINVAL;
goto error;
}
/* recv channel data */
channel_data->u.channel.data = zmalloc(channel_data->size);
if (!channel_data->u.channel.data) {
ret = -ENOMEM;
goto error;
}
len = ustcomm_recv_unix_sock(sock, channel_data->u.channel.data,
channel_data->size);
if (len != channel_data->size) {
if (len < 0)
ret = len;
else
ret = -EINVAL;
goto error_recv_data;
}
/* recv wakeup fd */
len = ustcomm_recv_fds_unix_sock(sock, &wakeup_fd, 1);
if (len <= 0) {
if (len < 0) {
ret = len;
goto error_recv_data;
} else {
ret = -EIO;
goto error_recv_data;
}
}
channel_data->u.channel.wakeup_fd = wakeup_fd;
*_channel_data = channel_data;
return 0;
error_recv_data:
free(channel_data->u.channel.data);
error:
free(channel_data);
error_alloc:
return ret;
}
/*
* Returns 0 on success, negative error value on error.
*/
int ustctl_recv_register_event(int sock,
int *session_objd,
int *channel_objd,
char *event_name,
int *loglevel,
char **signature,
size_t *nr_fields,
struct ustctl_field **fields,
char **model_emf_uri)
{
ssize_t len;
struct ustcomm_notify_event_msg msg;
size_t signature_len, fields_len, model_emf_uri_len;
char *a_sign = NULL, *a_model_emf_uri = NULL;
struct ustctl_field *a_fields = NULL;
len = ustcomm_recv_unix_sock(sock, &msg, sizeof(msg));
if (len > 0 && len != sizeof(msg))
return -EIO;
if (len == 0)
return -EPIPE;
if (len < 0)
return len;
*session_objd = msg.session_objd;
*channel_objd = msg.channel_objd;
strncpy(event_name, msg.event_name, LTTNG_UST_SYM_NAME_LEN);
event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
*loglevel = msg.loglevel;
signature_len = msg.signature_len;
fields_len = msg.fields_len;
if (fields_len % sizeof(*a_fields) != 0) {
return -EINVAL;
}
model_emf_uri_len = msg.model_emf_uri_len;
/* recv signature. contains at least \0. */
a_sign = zmalloc(signature_len);
if (!a_sign)
return -ENOMEM;
len = ustcomm_recv_unix_sock(sock, a_sign, signature_len);
if (len > 0 && len != signature_len) {
len = -EIO;
goto signature_error;
}
if (len == 0) {
len = -EPIPE;
goto signature_error;
}
if (len < 0) {
goto signature_error;
}
/* Enforce end of string */
a_sign[signature_len - 1] = '\0';
/* recv fields */
if (fields_len) {
a_fields = zmalloc(fields_len);
if (!a_fields) {
len = -ENOMEM;
goto signature_error;
}
len = ustcomm_recv_unix_sock(sock, a_fields, fields_len);
if (len > 0 && len != fields_len) {
len = -EIO;
goto fields_error;
}
if (len == 0) {
len = -EPIPE;
goto fields_error;
}
if (len < 0) {
goto fields_error;
}
}
if (model_emf_uri_len) {
/* recv model_emf_uri_len */
a_model_emf_uri = zmalloc(model_emf_uri_len);
if (!a_model_emf_uri) {
len = -ENOMEM;
goto fields_error;
}
len = ustcomm_recv_unix_sock(sock, a_model_emf_uri,
model_emf_uri_len);
if (len > 0 && len != model_emf_uri_len) {
len = -EIO;
goto model_error;
}
if (len == 0) {
len = -EPIPE;
goto model_error;
}
if (len < 0) {
goto model_error;
}
/* Enforce end of string */
a_model_emf_uri[model_emf_uri_len - 1] = '\0';
}
*signature = a_sign;
*nr_fields = fields_len / sizeof(*a_fields);
*fields = a_fields;
*model_emf_uri = a_model_emf_uri;
return 0;
model_error:
free(a_model_emf_uri);
fields_error:
free(a_fields);
signature_error:
free(a_sign);
return len;
}
/*
* Returns 0 on success, negative error value on error.
*/
int ustctl_recv_reg_msg(int sock,
enum ustctl_socket_type *type,
uint32_t *major,
uint32_t *minor,
uint32_t *pid,
uint32_t *ppid,
uint32_t *uid,
uint32_t *gid,
uint32_t *bits_per_long,
uint32_t *uint8_t_alignment,
uint32_t *uint16_t_alignment,
uint32_t *uint32_t_alignment,
uint32_t *uint64_t_alignment,
uint32_t *long_alignment,
int *byte_order,
char *name)
{
ssize_t len;
struct ustctl_reg_msg reg_msg;
len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg));
if (len > 0 && len != sizeof(reg_msg))
return -EIO;
if (len == 0)
return -EPIPE;
if (len < 0)
return len;
if (reg_msg.magic == LTTNG_UST_COMM_MAGIC) {
*byte_order = BYTE_ORDER == BIG_ENDIAN ?
BIG_ENDIAN : LITTLE_ENDIAN;
} else if (reg_msg.magic == bswap_32(LTTNG_UST_COMM_MAGIC)) {
*byte_order = BYTE_ORDER == BIG_ENDIAN ?
LITTLE_ENDIAN : BIG_ENDIAN;
} else {
return -LTTNG_UST_ERR_INVAL_MAGIC;
}
switch (reg_msg.socket_type) {
case 0: *type = USTCTL_SOCKET_CMD;
break;
case 1: *type = USTCTL_SOCKET_NOTIFY;
break;
default:
return -LTTNG_UST_ERR_INVAL_SOCKET_TYPE;
}
*major = reg_msg.major;
*minor = reg_msg.minor;
*pid = reg_msg.pid;
*ppid = reg_msg.ppid;
*uid = reg_msg.uid;
*gid = reg_msg.gid;
*bits_per_long = reg_msg.bits_per_long;
*uint8_t_alignment = reg_msg.uint8_t_alignment;
*uint16_t_alignment = reg_msg.uint16_t_alignment;
*uint32_t_alignment = reg_msg.uint32_t_alignment;
*uint64_t_alignment = reg_msg.uint64_t_alignment;
*long_alignment = reg_msg.long_alignment;
memcpy(name, reg_msg.name, LTTNG_UST_ABI_PROCNAME_LEN);
if (reg_msg.major != LTTNG_UST_ABI_MAJOR_VERSION) {
return -LTTNG_UST_ERR_UNSUP_MAJOR;
}
return 0;
}
